Audio Transformers


tr = pri : sec turns ratio

 Shielded 600 Ω Input, Output & Line-to-Line 600 Ω Modem & Telephone

 Input Transistor Driver Transistor Output Tube Output 70 Volt Line Misc.

The  *** Impedance determined by measurement.  notation identifies transformers for which no manufactures data was found and to determine spec's, a measurement was made to determine winding DC resistances and the open circuit turns ratio. The turns ratio provides an impedance ratio, but not the specific impedances the transformer was designed to provide and the listed values are simply what seemed most logical after trying various combinations and finding which provided, most closely, a 3 db output signal drop at 1KHz.

 

Shielded Transformers



1−5/8" x 1−5/8" x 2−1/8" H

Astatic LT-6

Microphone Line Matching

Pri:30−50 / 150−250 Ω
Sec: 40K Ω

 

NEW

Qty: 4

$30 ea.


1−3/16" dia. x 7/8"

Hammond140Q

Line To Line

Pri:600 C.T.
Sec: 600 C.T.

  Qty: 1

$27

Hammond List $54.55

1−5/8" x 1−5/8" x 2−1/8"h

Merrimack Magnetics #1845

Line to Line - Isolation Transformer

Pri:208 Ω C.T.  DC Resistance - Not Impedance
Sec: 280 Ω C.T.  DC Resistance - Not Impedance
*** Impedance still needs to be determined for this unit

1:1 Qty: 2

$30 ea.


600 Ω Input, Output & Line-to-Line



1/2" x 1/2" x 1/2"h

Hammond102D

600 Ω Line Input

Pri:600 Ω
Sec: 1500 Ω

20 mW

NEW

Qty: 3

$25 ea.

Hammond List $45.45

3/4"w x 5/8"d x 5/8"h

XX2

600 Ω Line Input

Pri:600( 150 Ω DC Resistance )
Sec: 1800 C.T. ( 188 Ω DC Resistance )
*** Impedance determined by measurement.

1:1.5

NEW

Qty: 1

$2


1"w x 3/4"d x 13/16"h

Hammond106E

600 Ω Line-Line

Pri:600 C.T.
Sec: 600 Ω

1:1
500 mW

Qty: 3

$25 ea.

Hammond List $45.45

3/4"w x 5/8"d x 5/8"h

XX1

600 Ω Line-Line

Pri:600( 1.7 Ω DC Resistance )
Sec: 600 C.T. ( 5.5 Ω DC Resistance )
*** Impedance determined by measurement.

1:1

Qty: 1

$2


3/4"w x 5/8"d x 5/8"h

42TM-0166 Mouser

600 Ω Line-Line

Pri:600 Ω C.T.
Sec: 600 Ω C.T.

200 mW

TM-016.pdf

Qty: 2

$2 ea.


1"w x 3/4"d x 13/16"h

Hammond149T

600 Ω Line-Line

Pri:600 C.T.
Sec: 600 C.T.

1 Watt

NEW

Qty: 2

$12 ea.

Hammond List $18.18

1−13/16"w x 1−9/16"d x 1−1/8"h

36-0019C

600 Ω Line-Line

Pri:150 / 600 Ω
Sec: 150 / 600 Ω

Schematic

Qty: 2

$10 ea.


3/4"w x 5/8"d x 5/8"h

423-001

600 Ω Line Output

Pri:100( 153 Ω DC Resistance )
Sec: 600 C.T. ( 240 Ω DC Resistance )
*** Impedance determined by measurement.

1:2.5

Qty: 1

$1


9/16"w x 1/2"d x 7/16"h

RB-20132

600 Ω Line Output

Pri:1200 Ω( 190 Ω DC Resistance )
Sec: 150/600 Ω (   40 Ω Total DC Resistance )
*** Impedance determined by measurement.

1.6:1

Qty: 2

$1 ea.


5/8"w x 5/8"d x 9/16"h

T-A089

600 Ω Line Output

Pri:1200 Ω( 76 Ω DC )
Sec: 150/600 Ω ( 17 Ω Total DC Resistance )
*** Impedance determined by measurement.

1.9:1

Qty: 1

$1


Modem & Telephone - 600 Ω


 Primary is Line Side - Secondary is Device Side

Phone Line Coupling

3/4"w x 11/16"d x 5/8"h

Mode60-606

Telephone

Pri:600 Ω
Sec: 600 Ω C.T.

1:1

NEW

Qty: 1

$3


1-1/16"w x 1"d x 13/16"h

Tele1

Telephone

Pri:600 Ω (58 Ω DC Resistance)
Sec: 600 Ω (75 Ω DC Resistance)
*** Impedance determined by measurement.

1:1

Qty: 2

$2 ea.


15/16"w x 3/4"d x 7/16"h

LB-1995-D1

Telephone

Pri:600 Ω (44 Ω DC Resistance)
Sec: 600 Ω (47 Ω DC Resistance)
*** Impedance determined by measurement.

1:1

Qty: 1

$2

Modem and/or Phone Line Coupling (Not sure which application these units were removed from)

5/8"w x 9/16"d x 7/16"h

110AH

Telephone/Modem

Pri:600 Ω (2.2 Ω DC Resistance)
Sec: 600 Ω (2.2 Ω DC Resistance)
*** Impedance determined by measurement.

1:1

Qty: 1

$2


1"w x 13/16"d x 7/8"h

710-004-001

Telephone/Modem

Pri:600 Ω (62 Ω DC Resistance)
Sec: 300 Ω (48 Ω DC Resistance)
*** Impedance determined by measurement.

1.3:1

Qty: 2

$2 ea.


3/4"w x 5/8"d x 7/16"h

74420005 / 4089MP

Telephone/Modem

Pri:600 Ω (58 Ω DC Resistance)
Sec: 300 Ω (52 Ω DC Resistance)
*** Impedance determined by measurement.

1.5:1

Qty: 2

$2 ea.


3/4"w x 5/8"d x 7/16"h

T9005V

Telephone/Modem

Pri:600 Ω ( 66 Ω DC Resistance)
Sec: 600 Ω ( 83 Ω DC Resistance)
*** Impedance determined by measurement.

1:1

Qty: 4

$2 ea.


13/16"w x 3/4"d x 9/16"h

TL580M82

Telephone/Modem

Pri:600 Ω(66 Ω DC Resistance)
Sec: 600 Ω C.T. (50 Ω DC Resistance)
*** Impedance determined by measurement.

1:1

Qty: 1

$2


13/16"w x 3/4"d x 9/16"h

F90219 / 74420097NR00

Telephone/Modem

Pri:600 Ω(3.6 Ω DC Resistance)
Sec: 600 Ω C.T. (3.6 Ω DC Resistance)
*** Impedance determined by measurement.

1:1

Qty: 1

$2


3/4"w x 7/8"d x 5/8"h

XX10

Telephone/Modem

Pri:600 Ω ( 100 Ω DC Resistance)
Sec: 600 Ω ( 100 Ω DC Resistance)
*** Impedance determined by measurement.

1:1

Qty: 2

$2 ea.

Modem

1"w x 13/16"d x 7/8"h

MicrotranT3220

Modem

Pri:600 Ω
Sec: 600 / 600 Ω

7 dBm
T3220 drawing

Qty: 1

$2


1"w x 29/32"d x 7/16"h

Midcom671-9372

Modem

Pri:600 Ω
Sec: 600 Ω

9372a.pdf
9372b.pdf
9372c.pdf

Qty: 1

$2


1"w x 3/4"d x 1/2"h

TamaraTTC-143

Modem

Pri:600 Ω
Sec: 600 Ω

TTC143.pdf

Qty: 1

$2


13/16"w x 3/4"d x 9/16"h

86032

Modem

Pri:600 Ω (  70 Ω DC Resistance)
Sec: 600 Ω (188 Ω DC Resistance)
*** Impedance determined by measurement.

1:1

Qty: 1

$2


13/16"w x 3/4"d x 9/16"h

TTC-109

Modem

Pri:600 Ω (  70 Ω DC Resistance)
Sec: 600 Ω (120 Ω DC Resistance)
*** Impedance determined by measurement.

1:1

Qty: 2

$2


11/16" x 11/16" x 1/2"h

DatatronicLM-301-1

Modem

Pri:600 Ω
Sec: 600 Ω

LM-302.pdf

Qty: 1

$2


Input


 

Sorry, Input Transformers
have all been Sold

   

Transistor Driver



3/8" x 3/8" x 3/8"h

ArmacoAT23

Transistor Driver

Pri:20K Ω
Sec:   1K Ω

 

NEW

Qty: 3

$2 ea.


13/16"w x 5/8"d x 5/8"h

X3

Transistor Driver

Pri: 10K( 547 Ω DC Resistance )
Sec: 2K C.T. ( 200 Ω DC Resistance )
*** No Data Sheet found - Spec's determined by measurement.

2.23:1

Qty: 1

$1


9/16"w x 1/2"d x 7/16"h

XX5

Transistor Driver

Pri:8K( 390 Ω DC Resistance )
Sec: 2K C.T. ( 160 Ω DC Resistance )
*** Impedance determined by measurement.

2:1

Qty: 1

$1


9/16"w x 1/2"d x 7/16"h

XX6

Transistor Driver

Pri:8K( 430 Ω DC Resistance )
Sec: 2K C.T. ( 170 Ω DC Resistance )
*** Impedance determined by measurement.

2:1

Qty: 1

$1


3/4"w x 5/8"d x 9/16"h

TR3-T2

Transistor Driver

Pri:4000 Ω ( 346 Ω DC Resistance )
Sec:   600 Ω (   32 Ω DC Resistance )
*** Impedance determined by measurement.

2.5:1

Qty: 2

$1 ea.


3/4"w x 5/8"d x 5/8"h

XX9

Transistor Driver

Pri:1200( 172 Ω DC Resistance )
Sec: 600 C.T. ( 100 Ω DC Resistance )
*** Impedance determined by measurement.

1:3.5

Qty: 1

$1


1"w x 3/4"d x 13/16"h

Hammond149C

Transistor Driver

Pri:160 Ω
Sec: 20 / 80 Ω

200 mW

NEW

Qty: 1

$12

Hammond List $18.18

1-3/16"w x 1-1/16"d x 1-1/8"h

FBT-27B

Transistor Driver

Pri:20K Ω ( 800 Ω DC )
Sec: 100 Ω  ( 7.2 Ω DC )
*** Impedance determined by measurement.

14:1
≈ 1.5 Watt

Qty: 1

$1


1-1/8"w x 1"d x 1"h

T62-603H

Transistor Driver

Pri:2000 Ω( 160 Ω DC )
Sec: 300 / 300 Ω  ( 15 / 15 Ω DC )
*** Impedance determined by measurement.

3.5:1
3.5:1
≈ 1.5 Watt

Qty: 1

$1 ea.


1−5/8"w x 1−1/8"d x 1−3/8"h

ArmacoAT-64

Transistor Driver

Pri:100 Ω
Sec: 200 C.T.

2 Watt

Qty: 1

$5


Transistor Output


3.2 Ω Transistor Output

7/8"w x 3/4"d x 11/16"h

ArmacoAT-51

Transistor Output

Pri:500 Ω C.T.
Sec: 3.2 Ω

12.5:1

NEW

Qty: 1

$2


13/16"w x 5/8"d x 11/16"h

Hammond148T

Transistor Output

Pri:500 Ω C.T.
Sec: 3.2 Ω

300 mW

NEW

Qty: 5

$10 ea.

Hammond List $18.18

1−1/8" x 1−1/8" x 1"h

SanyoV207A

Transistor Output

Pri:  700 Ω
Sec: 4 Ω

1 Watt

Qty: 1

$2


3/4"w x 5/8"d x 5/8"h

T-D-1003

Transistor Output

Pri: 2000 Ω C.T. ( 70 Ω DC )
Sec:3.2 Ω(  .1 Ω DC )
*** Impedance determined by measurement.

22:1

Qty: 1

$1


3/4"w x 3/4"d x 5/8"h

22600-21

Transistor Output

Pri: 3000 Ω ( 36 Ω DC )
Sec:3.2 Ω (  .1 Ω DC )
*** Impedance determined by measurement.

22.7:1

Qty: 1

$1

8 Ω Transistor Output

3"w x 2−1/2d" x 2−1/8"h

Hammond105314

Transistor Output from McCurdy AD975 Amplifier

Pri:8 Ω
Sec: 4 / 16 Ω  ( Two 8 Ω windings )
*** Impedance determined by measurement.

1:1:1

Qty: 1

$10


1−1/8"w x 1"d x 1"h

8392159

Transistor Output

Pri: 18 Ω ( 1 Ω DC )
Sec: 8 Ω ( .5 Ω DC )
*** Impedance determined by measurement.

1.5:1
≈ 1.5 Watt

Qty: 42+

$2 ea.


1−11/16"w x 1−3/16"d x 1−3/8"h

OPT3

Transistor Output from Automobile Radio

Pri:  32 Ω ( 2.0 Ω DC )
Sec:  8 Ω ( 1.2 Ω DC )
*** Impedance determined by measurement.

2:1
≈ 2 Watt

Qty: 1

$5


5/8"w x 5/8"d x 9/16"h

H3412K

Transistor Output

Pri: 50 Ω ( 1.8 Ω DC Resistance )
Sec: 8 Ω ( 0.5 Ω DC Resistance )
*** Impedance determined by measurement.

2.5:1

Qty: 1

$1 ea.


3/4"w x 5/8"d x 5/8"h

1479977-5

Transistor Output

Pri: 50 Ω ( 4.6 Ω DC )
Sec: 8 Ω (  .3 Ω DC )
*** Impedance determined by measurement.

3:1

Qty: 1

$1


1-1/16"w x 3/4"d x 3/4"h

QLA-0330

Transistor Output

Pri:100 Ω C.T. ( 5.2 Ω DC )
Sec: 8 & 1K Ω  ( .5 & 438 Ω DC - 2 seperate windings )
*** Impedance determined by measurement.

3.3:1
1:3.4
≈ 1 Watt

NEW

Qty: 1

$2 ea.


3/4"w x 5/8"d x 9/16"h

OPT2

Transistor Output

Pri:160 Ω C.T.
Sec: 8 Ω
*** Impedance determined by measurement.

4.5:1

Qty: 1

$1


1−1/16"w x 3/4"d x 3/4"h

Hammond149U

Transistor Output

Pri:150 / 600 Ω
Sec: 8 Ω
*** New except for being used temporarily in a prototype
     and leads cut shorter for Printed Circuit Board use.    

1 Watt

Qty: 1

$10

Hammond List $18.18

9/16"w x 9/16"d x 7/16"h

OPT1

Transistor Output

Pri:500 Ω
Sec: 8 Ω
*** Impedance determined by measurement.

7.5:1

Qty: 1

$1


1/2"w x 1/2"d x 3/8"h

427-506

Transistor Output

Pri:600 Ω( 58 Ω DC )
Sec: 8 / 300 Ω ( 0.8 Ω DC )
*** Impedance determined by measurement.

8:1

Qty: 1

$1


5/8"w x 5/8"d x 9/16"h

OPT5

Transistor Output

Pri: 600 Ω C.T. ( 34 Ω DC )
Sec:8 Ω(  .5 Ω DC )
*** Impedance determined by measurement.

8.75:1

Qty: 1

$1 ea.


3/4"w x 5/8"d x 5/8"h

OPT4

Transistor Output

Pri: 600 Ω C.T. ( 54 Ω DC )
Sec:8 Ω(  .5 Ω DC )
*** Impedance determined by measurement.

11:1

NEW

Qty: 1

$2


3/4"w x 5/8"d x 9/16"h

QLAT-0306

Transistor Output

Pri:450 Ω( 49 Ω DC)
Sec: 8 / 600 Ω ( 1 / 115 Ω DC, 1 winding with 8 Ω tap )
*** Impedance determined by measurement.

9.8:1
1:1.3

NEW

Qty: 1

$2

Other Transistor Output

2"w x 2"d x 2"h   0.55kg

306991-1   /   7737048

Transistor Output from Ampex PA Amplifier

Pri:1250 Ω C.T. (13 ohms DC)
Sec: Tapped Winding with 4 leads that I'm guessing are for 0 - 4 - 8 - 16 ohms.
*** 1250 Impedance based on turns ratio and 8 Ω sec.

25.0:1
12.5:1
7.07:1

Qty: 2

$10 ea.
2/$15


3/4"w x 3/4"d x 11/16"h

L181FC

Transistor Output

Pri:500 ( 210 Ω DC Resistance )
Sec:   32 (   12 Ω DC Resistance )
*** Impedance determined by measurement.

4:1

Qty: 2

$1 ea.


1-1/2"w x 1"d x 1-1/8"h

19B209079P1

Transistor Output that I believe is from a Heathkit Intercom with 40 Ω speakers that are also available.

Pri:150 Ω ( .9 Ω DC )
Sec:   40 Ω ( .1 Ω DC )
*** Impedance determined by measurement.

4.1:1

Qty: 1

$1


Tube Output


Sorry, All Tube Output
Transformers have been Sold

   

70 Volt Line



1−15/16"w x 1−1/4"d x 1−3/8"h

94-0054

Power Taps: 4, 2, 1, , Watt
Speaker Impedance: 4 / 8 Ω

4 Watt

Qty: 2

$8 ea.


1−15/16"w x 1−5/8"d x 1−5/8"h

Marsland53-192-2

Power Taps: 4, 2, 1, 0.5, 0.33, 0.25 Watt
Speaker Impedance: 8 Ω
500g

4 Watt

NEW

Qty: 1

$15


Misc.


HP-342A / HP-349A Transformer T101
P/N: 9120-0034

0.37kg1-7/8" dia. x 2.5"h

Qty: 1

$5

HP-236A Transformer T2
P/N: 9100-1310

0.13kg1-1/2"dia. x 1-1/2"h

Ref. 236A Drawing

Qty: 2

$5 ea.


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